brønsted acidic ionic liquid as the efficient and reusable catalyst for synthesis of coumarins via pechmann condensation under solvent-free conditions

Authors

abdol reza hajipour

nafisehsadat sheikhan

mohammad ali alaei

amin zarei

abstract

a mild and efficient method has been developed for the preparation of substituted coumarins from reaction of various phenols with different β-ketoesters via pechmann condensation in the presence of brønsted acidic ionic liquid (n-(4-sulfonic acid) butyl triethylammonium hydrogen sulfate) as an effective catalyst under solvent-free conditions. different phenols reacted with ethyl acetoacetate to produce the corresponding substituted coumarins in high to excellent yields and short reaction times. moreover, [tebsa][hso4] has been used as an effective green catalyst for the synthesis of coumarin derivatives under solvent-free conditions. using the relatively non-toxic (halogen-free) and reusable brønsted acidic ionic liquid, high catalytic efficiency, high yields, short reaction times and straightforward work-up are advantages of this protocol.

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Journal title:
iranian journal of catalysis

Publisher: islamic azad university, shahreza branch

ISSN 2252-0236

volume 5

issue 3 2015

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